貝殼으로 製造된 液狀形 緩衝劑 給與가 홀스타인 젖소의 産乳量, 乳成分 및 血液性狀에 미치는 影響

Abstract

Sodium bicarbonate has been widely utilized as a rumen pH buffer yet they tend to decrease palatability in parallel with the amount added in feed. In the current study, therefore we investigated effects of use of the liquid buffer as a cow feed additive which was designed to elicit buffering effects on rumen pH without compromising the palatability of feeds. A total of twenty seven mid-lactation dairy cows were included and then assigned into either 1) the control group, 2) the sodium bicarbonate group, or 3) the liquid buffer group (n = 9 per each group). For the control group, cows were fed with self-formulated TMR (Total Mixed Ration) for lactating cows while sodium bicarbonate (150 g sodium bicarbonate/cow/day) and liquid buffer (15 mL liquid buffer/cow/day) were fortified into the control diet for the sodium bicarbonate group and the liquid buffer group, respectively. In the results of feeding experiment, the milk yields of the control group, sodium bicarbonate group, and liquid buffer group were found to be 23.82, 23.91, and 24.91 kg, respectively; although there was a trend toward increase in the milk yield of the liquid buffer group, no statistical significance was noted. When it comes to the milk composition, there were significant differences in milk protein and solid-non-fat milk solids in the group treated with the liquid buffer compared to those of the control group (p < 0.05). Compared to the control group, the blood levels of glucose and cholesterols were slightly elevated by the liquid buffer treatment but no statistical significance was found amongst treatments. Taken together, we demonstrated that fortification of the liquid buffer proposed herein increased productivity, the milk composition in particular, hence might be utilized as a feed additive for dairy cows in order to replace sodium bicarbonate conventionally used for rumen pH buffer.